package testHashMapCode;

import java.util.HashMap;

/**
 * @author le
 */
public class HashMapCode {

    public static void main(String[] args) {
        HashMap<String, Object> map = new HashMap<>();

        map.put("name","null");
        map.put("name","dada");

        System.out.println(map.get("name"));
        System.out.println(map.size());

        int i = 0,j = 0;

        j = i++;

        i++;

        System.out.println(j+"   "+i);



    }



}
